/**
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License. See accompanying LICENSE file.
 */
package org.apache.oozie.workflow.lite;


import org.apache.oozie.workflow.WorkflowApp;
import org.apache.oozie.workflow.WorkflowException;
import org.apache.oozie.workflow.WorkflowInstance;
import org.apache.oozie.workflow.WorkflowLib;
import org.apache.oozie.service.Services;
import org.apache.oozie.service.UUIDService;
import org.apache.oozie.service.UUIDService.ApplicationType;
import org.apache.oozie.util.ParamChecker;
import org.apache.hadoop.conf.Configuration;

import javax.xml.validation.Schema;
import java.io.StringReader;

//TODO javadoc
public abstract class LiteWorkflowLib implements WorkflowLib {
    private Schema schema;
    private Class<? extends DecisionNodeHandler> decisionHandlerClass;
    private Class<? extends ActionNodeHandler> actionHandlerClass;

    public LiteWorkflowLib(Schema schema, Class<? extends DecisionNodeHandler> decisionHandlerClass,
                           Class<? extends ActionNodeHandler> actionHandlerClass) {
        this.schema = schema;
        this.decisionHandlerClass = decisionHandlerClass;
        this.actionHandlerClass = actionHandlerClass;
    }

    @Override
    public WorkflowApp parseDef(String appXml) throws WorkflowException {
        ParamChecker.notEmpty(appXml, "appXml");
        return new LiteWorkflowAppParser(schema, decisionHandlerClass, actionHandlerClass)
                .validateAndParse(new StringReader(appXml));
    }

    @Override
    public WorkflowInstance createInstance(WorkflowApp app, Configuration conf) throws WorkflowException {
        ParamChecker.notNull(app, "app");
        String jobId = Services.get().get(UUIDService.class).generateId(ApplicationType.WORKFLOW);
        return new LiteWorkflowInstance((LiteWorkflowApp) app, conf, jobId);
    }

    @Override
    public WorkflowInstance createInstance(WorkflowApp app, Configuration conf, String wfId) throws WorkflowException {
        ParamChecker.notNull(app, "app");
        ParamChecker.notNull(wfId, "wfId");
        return new LiteWorkflowInstance((LiteWorkflowApp) app, conf, wfId);
    }
}
